EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1059 AM EST SAT JAN 30 2016 VALID 12Z TUE FEB 02 2016 - 12Z SAT FEB 06 2016 ...HIGH-IMPACT WEATHER EXPECTED WITH A DEEP CYCLONE LIFTING OUT OF THE SOUTHERN HIGH PLAINS EARLY NEXT WEEK... ...OVERVIEW... A DEEP SURFACE CYCLONE WILL TRACK FROM THE SOUTHERN HIGH PLAINS TO THE UPPER GREAT LAKES EARLY NEXT WEEK AS THE LEADING ENERGY FROM A BROAD TROUGH OVER THE SOUTHWEST EJECTS OUT ACROSS THE PLAINS ON TUESDAY AND LIFTS INTO THE UPPER MISSISSIPPI VALLEY ON WEDNESDAY. ONCE THE SURFACE LOW LIFTS INTO CANADA LATER IN THE WEEK...THE PATTERN ALOFT SHOULD SETTLE INTO AN AMPLIFIED WEST COAST RIDGE/CENTRAL TO EASTERN U.S. THROUGH. ...SENSIBLE WEATHER HIGHLIGHTS... DURING THE FIRST HALF OF THE PERIOD THE HIGHEST POTENTIAL FOR HVY SNOW AND BLOWING/DRIFTING SHOULD EXTEND ALONG A CORRIDOR FROM PORTIONS OF THE CNTRL PLAINS INTO THE UPR GRTLKS. FINE TUNING THE ZONE OF GREATEST IMPACTS WILL BE SENSITIVE TO EXACT SFC LOW TRACK... FOR WHICH GUIDANCE IS STILL SHOWING SOME MODEST RUN TO RUN ADJUSTMENTS. COLD CYCLONIC FLOW IN THE WAKE OF THE LOW SHOULD SUPPORT A PERIOD OF LAKE EFFECT SNOW. CONSULT CURRENT SPC OUTLOOKS FOR LATEST INFO REGARDING SEVERE WEATHER THREAT IN THE WARM SECTOR. BASED ON OUTLOOKS FROM THE PAST COUPLE DAYS THERE HAS BEEN A FAIRLY CONSISTENT SIGNAL FOR SEVERE POTENTIAL FROM NEAR THE SRN HALF OF THE MS VLY TO JUST W OF THE CNTRL-SRN APLCHNS. ALSO SOME OF THE RNFL MAY BE ON THE HVY SIDE. OVER FLORIDA AND PARTS OF THE EAST COAST THE PCPN MAY BE SLUGGISH IN ITS DEPARTURE DUE TO ONE OR MORE FRONTAL WAVES. PCPN OVER THE WEST SHOULD BE CONFINED MOSTLY TO AREAS FROM THE CNTRL-NRN WEST COAST INTO THE NRN ROCKIES WITH MOST ACTIVITY IN THE LGT-MDT RANGE. EXPECT WELL BELOW NORMAL TEMPS FROM THE CNTRL-SRN INTERIOR WEST INTO THE CNTRL PLAINS TUE-THU WITH A FAIRLY BROAD AREA OF MINUS 10-20F ANOMALIES FOR HIGHS. TEMPS OVER THESE REGIONS WILL MODERATE THEREAFTER. AREAS TO THE E IN THE WARM SECTOR WILL LIKELY SEE SIMILARLY EXTREME ANOMALIES ON THE WARM SIDE FOR HIGHS TUE-WED WITH MORNING MIN TEMPS PSBLY UP TO 20-30F ABOVE NORMAL AT SOME LOCATIONS. FRONTAL PASSAGE WILL BRING NEAR TO SOMEWHAT BELOW NORMAL READINGS INTO THE ERN STATES FOR LATE IN THE WEEK. GERHARDT